Objects not appearing in the final render
Possible causes for a Blank render:


No lights in scene.
Objects disabled for Render in outliner (camera icon).
Strips in VSE and Sequencer enabled.
Objects in different layer, or in a layer disabled in Render Layers.
Object blocked by other objects.
Active camera aiming in a different direction.
An object in the scene set as active camera.
Any, some or all of the above.